Roll.



similar to the material from which STATE$ ?ATENT @Fid JOHN J. EVANS AN-D REES LEWIS, OF NEW CASTLE, PENNSYLVANIA.

ROLL.

. n V ce ses.

s ecineauon of Letters Patent.

Patented Feb. 25, recs.

Application filed April 12. 1907 Serial No, 367.880-

To ZZZ whom it con-cam: Y

Be 1 .own that we, JOHN J. EVANS, a citizen. of the United States'of America, and Ears lJEW' 'subject of" the King of Great Britain, rec sing at New castlefin the county of Lawrence and State of Pennsylvania, have invented certain new and useful Improveme ts in Rolls, of which the following is a specification, reference being bad therein to the accompanying drawing.

This invention relates to improvements in rolls, and the invention has for its object to provide a roll with positive and reliable means for strengthening and preventing the some from breaking or cracking due to the expansion and contraction of the roll.

Another object of this invention is to provide a roll with a soft metal core, which will sustain the roll when expanded and contracted, the soft metal core having properties susceptible to expansion and contraction the roll is constructed.

A further obgect of'tnis invention is to construct a roll whereby it will withstand the rougl'i usage to which it is ordinarily subgected, the roll being comparatively inexpen- 'sive to manufacture and highl efiicient for the purpose for which it may e used. With the above and other objects in view,

the invention consists in the novel construetion, combination and arrangement of parts .to be hereinafter more fully described and then specifically pointed out in the appended claimeand referring to the drawing form'- ing part oi' this specification, like numerals of reference designate correspondin parts throughout the several views, in which:

Figure 1 ice side elevation of the roll constructed in accordance with our invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 i a cross sectional view of the same.

For the purpose of illustrating a practical embodiment of our invention, we have shown a roll 1 which in its form is similar to an ordi ary sizing roll, and is shown as provided with the usual-collars 2 and necks 3.

' To practice our invention, we take a roll such as that shown and above described,

and provide the same longitudinally with a central care i extending "from end to end of the roll, and in tms bore 4 we insert a soft metal core 5, the core 5 being of a metal which is considerably softer in its nature settingthe ends of the core 5 as clearly seen in Fig. 2 of the drawings.

As preliminarily stated, the object of the invention is to prevent the breaking or cracking of the roll 1 due to the expansion and contraction of the roll. These rolls are generally of steel and the extreme varia tions in temperature to which they areconstantly subjected has a decided tendency to cause them to break or crack thereby renderin the same worthless for'further use. Vv'ith a soft metal core placed within. such a steel roll, and, as stated, preferably a copper core, it has been found that the danger of the roll cracking or breaking is reduced to a minimum, due to the fact that when the steel roll contracts, the copper core also contracts, and its susceptibility to contra-c tion being greater than that of the steel roll, the core gives way as it were to the steel roll, and verymaterially reduces the danger of the roll cracking due 'to contraction thereof. Also, when the steel roll expands the copper core also'expands, and the 'sus ceptibility of the copper to expansion being greater than that of the steel roll, the copper core exp ands to a greater extent than the steel roll, though this difference in expansion as has been demonstrated .is not sufficient/5o injure the roll, owing to the different natures of the two metals. The copper core in its ex panded form becomes stronger to support the roll and prevent danger of the latter breaking under the strains to which it may be subjected. As stated, we prefer to use the copper, and in practice have used this particular material for the core on account of its being a tougher metal than other soft metal, and also on account of its becoming more indurate and tenacious in its ex anded condition, thereby aiding mate'- ria l ly in the strengthening of the roll and reducing the danger of the roll breaking under severe strains. The roll is therefore strengthened under all conditions of temperature to which it is subjected, the copper core in its expanded condition being stronger and adding strength to the roll 1, and in'its contracted condition being tough, and having greater susceptibility to contraction than the steel roll, will allow the latter to contract Without danger of cracking during contraction.

It is of course understood that while we have shown the core 5 secured in the roll 1 by upsetting the ends of the core, which method is the preferable one owing to the i act that by this means air is excluded from the bore, yet the core may be secured in the roll in anydesired or a proved manner.

Whatwe claim an desire to secure by Letters Patent, is

A roll comprising a body portion formed with a collar and neck at each end thereof, said roll further provided with a centrallydisposed longitudinal bore extending from end to end thereof, and a core of copper tightly disposed insaid bore. 7

In testimony whereof we aflix our signatures in the presence of two witneses.

JOHN J. EVANS. REES LEWIS. 

